Hi Hashcode_io,
One way you could achieve this would be to add a custom JavaScript script to the Shopify theme that will listen for the "Add to Cart" button click event (which might require using the Asset API). When the event occurs, it captures the necessary data (like product ID, quantity, etc.) and you could use an AJAX call to send this data to a specific endpoint on your server. Then you'd create an endpoint in your backend application. This endpoint will be the URL to which the AJAX call sends the "Add to Cart" data. Finally you could write logic to handle the incoming JSON data (parse it, validate, etc.).
Hope this helps!
